陕西省镇安县曹家沟铅锌矿床地质特质及找矿前景

Geological characteristics and prospecting prospect of Caojiagou Pb-Zn deposit in Zhenan County of Shaanxi Province

陕西镇安县曹家沟位于江口青铜关晚古生代陆表海。区内已发现铅锌矿化蚀变带4条,长920~3800m,宽3~23m,已圈出铅锌矿体6条,矿体长290~1950m,厚1.0~8.45m,锌品位为0.99%~11.47%,铅品位为0.47%~6.3%。矿化带主体由上泥盆统-下石炭统铁山组微晶(生屑)灰岩组成,产于铁山组NWW向层间破碎带中。矿化主要受地层和构造的控制。经预测,曹家沟一带铅锌矿有较好的找矿远景,具有形成中-大型铅锌矿的潜力。

Caojiagou in Zhenan County of Shaanxi is located in the continental sea of late Paleozoic in Jiangkou Qingtongguan district.There has been found for 4 Pb-Zn mineralization alteration belts,which are 920-3800 mlong,3-23 m wide.Six Pb-Zn orebodies have been determined,which are 290-1950 mlong,1.00-8.45 mthick,with Zn grade of 0.99% to 11.47% and Pb grade of 0.47% to 6.3%.The mineralization belts are mainly consist of microcrystalline bioclastic limestone of Tieshan Formation of Upper Devonian-Lower Carboniferous,occur in NWW direction of the inter-layered fracture zone in Tieshan formation.The mineralization is mainly controlled by the strata and structures.The forecast result is that,there is a good prospecting prospect of PbZn deposit in Caojiagou area,with the exploration potential of Pb-Zn deposit of medium to large scale.